Texas Instruments TI-99 4A - Command Modules (TOSEC-v2006-04-21)

"The Texas Instruments TI-99/4A was an early home computer, released in June 1981, originally at a price of USD $525. It was an enhanced version of the less-successful—and quite rare—TI-99/4 model, which was released in late 1979 at a price of $1,150. The TI-99/4A added an additional graphics mode, "lowercase" characters comprised of small capitals, and a full travel keyboard. Its predecessor,